Hansen Dam (in its watershed context)
E609330
Hansen Dam (in its watershed context) is a major flood-control and water-management structure within the Santa Ana River system, helping regulate river flows, reduce downstream flooding, and support regional water resources.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Hansen Dam (in its watershed context) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6659557 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Hansen Dam (in its watershed context) Context triple: [Santa Ana River, hasDam, Hansen Dam (in its watershed context)]
-
A.
Fengman Dam
Fengman Dam is a large hydroelectric gravity dam on the Songhua River in Jilin Province, China, known for its significant role in regional power generation and flood control.
-
B.
Harris Station Dam
Harris Station Dam is a large hydroelectric dam in Maine that forms Indian Pond and serves as a major power-generating facility on the Kennebec River.
-
C.
Merwin Dam
Merwin Dam is a hydroelectric dam on Washington State’s Lewis River that forms Lake Merwin and generates power for the region.
-
D.
Howden Dam
Howden Dam is a large masonry dam in Derbyshire, England, forming part of the Upper Derwent Valley reservoir system and known for its impressive architecture and role in regional water supply.
-
E.
Duncan Dam
Duncan Dam is a major hydroelectric and flood-control dam on the Duncan River in British Columbia, forming part of the Columbia River Treaty system.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Hansen Dam (in its watershed context) Target entity description: Hansen Dam (in its watershed context) is a major flood-control and water-management structure within the Santa Ana River system, helping regulate river flows, reduce downstream flooding, and support regional water resources.
-
A.
Fengman Dam
Fengman Dam is a large hydroelectric gravity dam on the Songhua River in Jilin Province, China, known for its significant role in regional power generation and flood control.
-
B.
Harris Station Dam
Harris Station Dam is a large hydroelectric dam in Maine that forms Indian Pond and serves as a major power-generating facility on the Kennebec River.
-
C.
Merwin Dam
Merwin Dam is a hydroelectric dam on Washington State’s Lewis River that forms Lake Merwin and generates power for the region.
-
D.
Howden Dam
Howden Dam is a large masonry dam in Derbyshire, England, forming part of the Upper Derwent Valley reservoir system and known for its impressive architecture and role in regional water supply.
-
E.
Duncan Dam
Duncan Dam is a major hydroelectric and flood-control dam on the Duncan River in British Columbia, forming part of the Columbia River Treaty system.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
flood control dam
ⓘ
water-management infrastructure ⓘ |
| associatedWith | Los Angeles River flood control channel NERFINISHED ⓘ |
| basin | Los Angeles River watershed ⓘ |
| constructedAsResponseTo | historic flooding in Los Angeles region in the early 20th century ⓘ |
| constructionStartDate | 1939 ⓘ |
| controls | peak storm flows in Tujunga Wash ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses | Tujunga Wash NERFINISHED ⓘ |
| designedFor | protection of downstream communities from flooding ⓘ |
| elevation | approximately 1,060 feet above sea level ⓘ |
| hasLandUse |
open space
ⓘ
recreational facilities ⓘ wildlife management areas ⓘ |
| hasPart |
Hansen Dam Aquatic Center
NERFINISHED
ⓘ
Hansen Dam Golf Course NERFINISHED ⓘ Hansen Dam Recreation Area NERFINISHED ⓘ Hansen Dam Reservoir NERFINISHED ⓘ |
| helpsProtect |
commercial and industrial areas downstream
ⓘ
residential areas downstream ⓘ transportation infrastructure downstream ⓘ |
| hydrologicFunction |
attenuation of flood peaks
ⓘ
temporary detention of storm runoff ⓘ |
| locatedIn |
Los Angeles County
ⓘ
surface form:
Los Angeles County, California
San Fernando Valley NERFINISHED ⓘ |
| managedBy | United States Army Corps of Engineers NERFINISHED ⓘ |
| monitoredBy | United States Army Corps of Engineers Los Angeles District NERFINISHED ⓘ |
| namedAfter | Homer Hansen NERFINISHED ⓘ |
| near | Pacoima, Los Angeles NERFINISHED ⓘ |
| openingDate | 1940 ⓘ |
| operatedFor |
multi-purpose recreation
ⓘ
public safety ⓘ |
| ownedBy | United States government ⓘ |
| partOf |
Los Angeles County flood control system
ⓘ
federal flood risk management projects in Southern California ⓘ |
| purpose |
flood control
ⓘ
groundwater recharge support ⓘ recreation support ⓘ stormwater management ⓘ |
| region | Southern California ⓘ |
| regulates | downstream flows to the Los Angeles River ⓘ |
| riskReductionFor |
flooding in downstream Los Angeles communities
ⓘ
flooding in the San Fernando Valley ⓘ |
| supports |
local groundwater recharge through managed releases and percolation downstream
ⓘ
regional water resources management ⓘ wildlife habitat in the reservoir and riparian areas ⓘ |
| type | earth-fill dam ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Hansen Dam (in its watershed context) Description of subject: Hansen Dam (in its watershed context) is a major flood-control and water-management structure within the Santa Ana River system, helping regulate river flows, reduce downstream flooding, and support regional water resources.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.